after install CR and Slim QSB and POST QSB and readthe nand with j-runner 2 time and compare is ok and program the CR and create the ECC the CR not glitch and xbox not boot so i try to write back the orignal nand i can boot with no problem then i try to remove the POST QSB and after i remove it the xbox not able to boot completly and give me red light im try to check the point there is no solder on it is this the problem ?